How to prepare sodium hypochlorite solution in domestic level?

On the domestic level, you don't prepare it; you buy it. Ordinary bleach is an impure solution of sodium hypochlorite.

Or take pure chlorine gas and push it through a solution of NaOH. Of course, it's not going to be all that pure when doing it, but you'll ge some sodium hypochlorite out of it.

Rombo nandri Jhon

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Thanks a lot for your answer Jhon

If you pass a current through salt water, you will end up with a mixture of sodium... hydroxide, hypochlorite, and chloride left over. This makes some chlorine gas though, so it requires very good ventilation. The negative electrode can be made of metal, but the positive electrode will corrode using most metals, and needs to be either coated in a noble metal, or just made of something like carbon. Remember that I am giving you this information to help you understand the topic you asked about, and before you ever try anything like this you must know what you are doing. You can get seriously hurt with chemistry.

Edited June 28, 200916 yr by Justonium

If the solution is alkaline enough you can weigh it before chlorination and after.

This way one can determen the strenght of the hypo.

Also it is common to use regular bleach then add NaOH and chlorinate to bring up the concentration, watch out with themal destruction.